	public synchronized void  deposit(int money){
		
		this.balance  = this.balance + money;
		if(this.balance > 0) 
			notify();
	}
	public synchronized void  withdraw(int money) {
		try{	
			while(this.balance - money < 0){
				wait ();
			}
			this.balance  = this.balance - money;
		}catch(Exception e){	
		}